Stan, Xev, Kai and a second living Kai they have picked up, find themselves together in a balloon over the planet Fire. Duke (Ralph Brown), one of the rulers of Fire, is also on board, with his sidekick, Fifi. But the balloon drifts over the Red Hot Sea and soon starts to descend. It is clear that not everyone is going to make it unless they lose weight and therefore they have to make the difficult choice of who goes over the side.